[2024][ruby][10.x] refactored to bring part one back

2024/ruby/day_10.rb

@@ -26,13 +26,18 @@ def trails(map, head)
   end
 
   finished
-    .select { _1.length > 2 && map.fetch(_1.last) == 9 }
+    .select { map.fetch(_1.last) == 9 }
     .uniq
 end
 
+# part one
+pp trailheads.sum { trails(map, _1).map(&:last).uniq.length }
+
+# part two
 pp trailheads.sum { trails(map, _1).length }
 
 __END__
+89010123
 78121874
 87430965
 96549874